html{
    height: 100%;
}
body{
    width: 100%;
    height: 100%;
    background: radial-gradient(circle,blue 0%, dodgerblue 33%, cornflowerblue 66%, deepskyblue 100%);
    /*弹性布局
    主轴方向居中
    交叉轴方向居中*/
    display: flex;
    justify-content: center;
    align-items:  center;
}
div{
    text-align: center;
}
div>span:nth-child(1){
    font-size: 220px;
    font-family: 宋体;
    display: inline-block;
    color: black;
}
div>span:nth-child(3){
    font-size: 20px;
    font-family: 楷体;
}
